Water-heater.



S. SOEDA.

WATER HEATER.

APPLICATION FILED DBO. 17, 1912.

1,077,648. Patented Nov. 4, 1913:

WlTN ESSES IN VENTOR Lfadmx-i 5 1. A; ATTORNEY SADAMI SOEDA, OF ALAMEDA,CALIFORNIA.

WATER-HEATER.

Specification of Letters Patent.

Application filed December 17, 1912. Serial No. 737,244.

To all whom, it may concern Be it known that I, SADAMI Sonnn, a subjectof the Emperor of Japan, residing at Alameda, in the county of Alamedaand State of California, have invented new and useful Improvements inWater-Heaters, of which the following is a specification.

The object of the invention is to provide an improved form of waterheater for laundrymen and others who use large quantities of hot water.At present it is the practice to heat a large tank, say 8 feet indiameter and 7 feet high, of water by introducing steam thereinto bymeans of a pipe discharging directly into the tank. This method ofheating, however, is objectionable on account of the loud noise, whichaccompanies the discharge of steam into the tank. Furthermore, only theupper part of the water in the tank first becomes hot. I have invented aheating apparatus using steam for the heating medium, which is not onlyfree from noise, but in which a large body of hot water of uniformtemperature can be obtained in about one-half the time used with theapparatus above referred to.

In the accompanying drawing, Figure 1 is a vertical section of a tankequipped with my improved heating apparatus; Fig. 2 is a verticalsection on an enlarged scale of a portion of said apparatus.

Referring to the drawing, 1 indicates a tank, preferably cylindrical inform, for containing water to be heated. On the base of this tank at thecenter is secured a large cylinder 2, closed at the top, the cylindricalwall of which is formed for about threequarters of its height with alarge number of small apertures 3. Secured centrally upon the basewithin the cylinder 2, is an intermediate cylinder 4, closed at the top,in the cylindrical wall of which is located at about three-quarters ofits height, a horizontal row of apertures 6. Through said wall be; lowsaid apertures extend about ten pipes 8, each pipe leading from a pointnear the bottom of the tank upward, close to the wall of the cylinder 4,then through said wall, then downward again outside said wall to a pointnear the bottom of the tank, and then outward and through the wall ofthe cylinder 2, and within the tank 1. Secured centrally upon the bottomof the tank, within the intermediate cylinder 4:, is a small cylinder 9,having a closed top, the whole of the cylindrical wall of which isformed with a large number of perforations 11. A steam pipe 12 leadsinto the tank 1, and passes downward through the centers of the tops ofthe cylinders 2, 4 and 9, terminating, at about the center of thecylinder 9, in a conical extension 13. Both the bottom wall 14 and theconical wall 16 of this extension are formed with a large number ofperforations 17.

The utility of this apparatus will appear from the followingconsiderations. Since in the ordinary type of heater the end of thesteam pipe was freely open to a large body of comparatively cold water,the result was that, as soon as there was a discharge of steamtherefrom, the water closely adjacent to the end of the pipe becamehighly heated, to substantially boiling point, and this boiling waterrapidly ascended, and was replaced by cold water, which quicklycondensed the steam which attempted to enter the tank from the pipe, sothat the water entered the end of the steam pipe and remained thereinuntil it was raised to boiling point, could no longer condense steam,and was discharged by the pressure of the steam. The discharge wastherefore intermittentand explosive in character, and caused a loudnoise at each discharge, for the reason that the discharge took placeonly when the pressure of the steam increased sufficiently to overcomethe pressure of the head of water in the tank. Immediately after thedischarge, the pressure of the steam fell, whereupon the Water againentered the steam pipe, and was then gradually forced back therefromuntil the steam pressure again became sufficient to overcome thepressure of the said head, whereuponanother discharge took place. Byforming the end of the steam pipe with an enlarged extension, with smallperforations no Water can enter said pipe, but there is a substantiallycontinuous discharge of steam therefrom. Also by causing the steam pipeto discharge, not directly into a large body of comparatively coolwater, but into a small body of water which is substantially at boilingpoint, this body of water being separated from the remainder of thewater by the cylinder 9, no cold water can come in direct contact withthe steam emerging from the steam pipe, but the water which does come incontact with it is of very nearly the same temperature, and consequentlythereis no condensation of the steam in the pipe, as in the PatentedNov. 4, 1913.

while the water at the bottom remains comparatively cool. In myapparatus, by the use of the perforated cylinders successivelyincreasing in size, and contained one within the other, such a resultcannot occur, but

the body of water is uniformly heated.

The intermediate cylinder 4 may be considered as a heater for thecylinder 9, and

the object of the arrangement of the horizontal row of apertures 6 inthe upper part of the wall of the said cylinder, and of the series ofpipes 8, is to promote the circulation of Water through said wall, bydrawing the cold water from outside the cylinder 2 and inside thecylinder 1 into said cylinder 4, where it is heated by the water atalmost boiling temperature issuing from the perforations in the cylinder9, and flows upwardly and is discharged outwardly through theperforations 6. In this way the body of water in the cylinder 2 israised to a substantially uniform temperature before it can'escapethrough the apertures 3. On account of the large number of saidapertures, it is evident that there can be no great difference intemperature between the water at different portions of the tank 1outside the cylinder 2. In case the water within the cylinder 4 shouldbecome too hot, said pipes 8 provide an outlet for said hot water direct7 into the tank 1, but said passage of hot water is rendered moredifiicult by directing each pipe 8 first upwardly and then downwardly asshown in the drawing.

I claim 1. .In an apparatus for heating by steam a body of water in atank, a large vessel, secured at the bottom of the tank and having aperforated wall, an intermediate vessel contained within the firstnan1edvessel at the bottom thereof, and having in its wall contained withinthe first-named vessel at.

the bottom thereof, and having in its wall near the top a horizontal rowof apertures,

pipes leading through said latter wall and then downwardly, a smallvessel within the intermediate vessel, and secured at the bottom thereofand having perforations in its vertical wall, and a steam pipedischarging into said small vessel, and having a flaring extensionhaving small apertures only.

3. In an apparatus for heating by steam a body of water in a tank, avessel, secured at the bottom of the tank and having a per forated wall,an intermediate vessel contained within the first-named vessel at thebottom thereof, and having in its wall near the top a horizontal row ofapertures, a small vessel within the intermediate vessel, and secured atthe bottom thereof and having perforations in its vertical wall, a steam1 pipe discharging into said small vessel, and pipes passing through theWall of the intermediate vessel and leading from the bottom of the tankfirst upwardly within said wall and then downwardly to a point near thebottom of the tank, and then outwardly through the wall of the largevessel.

In testimony whereof I have hereunto set my hand in the presence of twosubscribing witnesses.

SADAMI SOEDA.

Witnesses:

FRANoIs M. WRIGHT, D. B. RICHARDS.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents,

Washington, D. G.

